CN111816332B - Control rod and high-temperature gas cooled reactor - Google Patents
Control rod and high-temperature gas cooled reactor Download PDFInfo
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- CN111816332B CN111816332B CN202010618944.0A CN202010618944A CN111816332B CN 111816332 B CN111816332 B CN 111816332B CN 202010618944 A CN202010618944 A CN 202010618944A CN 111816332 B CN111816332 B CN 111816332B
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- ring
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/10—Construction of control elements
- G21C7/11—Deformable control elements, e.g. flexible, telescopic, articulated
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/20—Disposition of shock-absorbing devices ; Braking arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a control rod, which comprises a rod body and a first buffer joint, wherein the first buffer joint is arranged at the upper part of the rod body and comprises a laminated plate, a shock absorption ring and a first elastic piece; the shock absorption ring comprises a bottom ring and an upright post, the bottom ring is sleeved outside the rod body, the bottom end of the upright post is connected with the bottom ring, and the top end of the upright post penetrates through the through hole of the laminated board; the first elastic piece is sleeved on the upright post, one end of the first elastic piece is abutted against the bottom ring, and the other end of the first elastic piece is abutted against the laminated board. The invention also discloses a high-temperature gas cooled reactor comprising the control rod. The invention can reduce the collision strength of the control rod and the graphite layer in the rod drop accident, thereby avoiding the control rod and the graphite layer from being damaged.
Description
Technical Field
The invention belongs to the technical field of nuclear, and particularly relates to a control rod and a high-temperature gas cooled reactor comprising the same.
Background
The high temperature gas cooled reactor (HTGR) is a reactor type in nuclear power reactors, and is an advanced reactor type developed on the basis of an early gas cooled reactor and an improved gas cooled reactor, such as a thorium high temperature gas cooled reactor demonstration power plant (THTR-300) in Germany. With the increasing attention paid to the safety problem of the nuclear power plant, the current commercial power station of the high-temperature gas cooled reactor is developed from the original direction of large scale, and the development of a modular high-temperature gas cooled reactor with passive inherent safety is changed.
The rod dropping accident is one of accidents of the high-temperature gas cooled reactor nuclear power station, in the rod dropping accident, a control rod drops, part of drive mechanism assemblies drop along with the control rod, and large kinetic energy is generated, so that the lower end of the control rod collides with a graphite layer at the bottom of a reactor core violently, the control rod and the graphite layer are damaged, and normal work cannot be continued.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a control rod and a high temperature gas cooled reactor including the same, which can reduce the collision strength between the control rod and the graphite layer in a rod drop accident, thereby preventing the control rod and the graphite layer from being damaged.
According to one aspect of the invention, a control rod is provided, which comprises the following technical scheme:
a control rod comprises a rod body and a first buffer joint, wherein the first buffer joint is arranged at the upper part of the rod body,
the first buffer joint comprises a laminated plate, a shock absorption ring and a first elastic piece,
the laminated board is connected with the outer wall of the rod body, and a through hole is formed in the laminated board;
the shock absorption ring comprises a bottom ring and an upright post, the bottom ring is sleeved outside the rod body, the bottom end of the upright post is connected with the bottom ring, and the top end of the upright post penetrates through the through hole of the laminated board;
the first elastic piece is sleeved on the upright post, one end of the first elastic piece is abutted against the bottom ring, and the other end of the first elastic piece is abutted against the laminated board.
Preferably, the first buffer section further comprises an adjustment assembly,
the adjusting assembly is arranged at the top end of the upright column, and is respectively arranged on the upper side and the lower side of the laminated board together with the first elastic piece, so as to adjust the distance between the laminated board and the bottom ring.
Preferably, the first elastic member is a disc spring, the number of the first elastic members is multiple groups,
the number of the upright posts is a plurality corresponding to the number of the groups of the first elastic pieces, and the upright posts are uniformly distributed on the bottom ring;
the number of the through holes is also multiple, and the positions of the through holes correspond to the upright posts one by one.
Preferably, the buffering rod further comprises a second buffering section, and the second buffering section is arranged at the bottom end of the rod body.
Preferably, the second buffer node comprises a second elastic member, a buffer head, and a pre-tightening ring,
the bottom end of the rod body is provided with a concave part, and the pre-tightening ring is positioned in the concave part and is in threaded connection with the inner wall of the rod body;
the head end of the buffer head penetrates through the inner hole of the pre-tightening ring and is clamped in the concave part, the second elastic piece is arranged in the concave part, one end of the second elastic piece abuts against the top end of the concave part, and the other end of the second elastic piece abuts against the head end of the buffer head.
Preferably, a first convex part is arranged in the concave part, the head end of the buffer head extends upwards to form a second convex part, the pretensioning ring is clamped in the concave part through the second convex part,
the second elastic piece is a compression spring, one end of the second elastic piece is sleeved on the first convex part, and the other end of the second elastic piece is sleeved on the second convex part.
Preferably, a boss is arranged at the bottom of the pre-tightening ring, extends out of the bottom end of the rod body and does not exceed the length of the tail end of the buffer head.
Preferably, a gap is reserved between the cushioning ring and the rod body, and a gap is reserved between the pre-tightening ring and the buffering head.
Preferably, the rod body is hollow, a cooling channel is arranged in the rod body, and the cooling channel is provided with a reducing section.
Compared with the traditional control rod, the control rod of the invention has at least the following beneficial effects: the device not only can effectively absorb the kinetic energy generated in the falling process of the control rod, thereby playing a role of buffering, obviously reducing or stopping the falling speed of the control rod, avoiding the control rod from being damaged due to severe collision with a graphite layer at the bottom of a reactor core, and also ensuring the falling objects such as the control rod in the rod falling accident to swing, so that the falling direction is always kept coaxial with a hole channel for installing the control rod, thereby avoiding the control rod from being damaged due to friction or collision with the inner wall of the hole channel, further prolonging the service life of the control rod, and has simple structure, small change compared with the traditional control rod structure, convenient processing, installation, replacement and other operations, and is applicable to various existing reactors, especially high-temperature gas cooled reactors.
According to another aspect of the invention, a high temperature gas cooled reactor is provided, which has the technical scheme as follows:
a high-temperature gas cooled reactor comprises a reactor core and control rods, wherein a graphite layer is arranged at the bottom of the reactor core, a support plate is arranged above the reactor core, the control rods adopt the control rods,
when the control rod is positioned on a station, the distance from the first buffer joint to the support plate is smaller than or equal to the distance from the second buffer joint to the graphite layer.
The high-temperature gas cooled reactor can reduce the collision strength between the control rod and the bottom graphite to the maximum extent due to the adoption of the control rod, thereby ensuring that the control rod and the graphite layer at the bottom of the reactor core are prevented from being damaged due to severe collision and ensuring the integrity of the control rod and the graphite layer.
Drawings
FIG. 1 is a schematic structural view of a control rod according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a first buffer segment according to an embodiment of the present invention;
FIG. 3 isbase:Sub>A sectional view A-A of FIG. 2;
FIG. 4 is a schematic structural diagram of a second buffer node according to an embodiment of the present invention;
fig. 5 is a sectional view B-B of fig. 4.
In the figure: 1-a rod body; 11-a recess; 12-a first convex portion; 2-a first buffer section; 21-a laminate; 22-a first elastic member; 23-a bottom ring; 24-a column; 25-pre-tightening the bolt; 26-a gasket; 3-a second buffer section; 31-a second elastic member; 32-a buffer head; 321-a second projection; 33-a pre-tensioning ring; 331-a boss; 4-a support plate; 5-a cooling channel; 51-a variable diameter section.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be further clearly and completely described below with reference to the accompanying drawings and specific embodiments of the present invention.
Aiming at the problems that the rod drop accident in the prior art easily causes the damage of a control rod and a graphite layer and the like, the invention provides the control rod which comprises a rod body and a first buffer joint, wherein the first buffer joint is arranged at the upper part of the rod body and comprises a laminated plate, a buffering ring and a first elastic piece,
the laminated board is connected with the outer wall of the rod body, and a through hole is formed in the laminated board;
the shock absorption ring comprises a bottom ring and an upright post, the bottom ring is sleeved outside the rod body, the bottom end of the upright post is connected with the bottom ring, and the top end of the upright post penetrates through the through hole of the laminated board;
the first elastic piece is sleeved on the upright post, one end of the first elastic piece is propped against the bottom ring, and the other end of the first elastic piece is propped against the laminated board.
Correspondingly, the invention also provides a high-temperature gas cooled reactor, which comprises a reactor core and control rods, wherein the bottom of the reactor core is provided with a graphite layer, a support plate is arranged above the reactor core, the control rods adopt the control rods,
when the control rod is positioned on the station, the distance from the first buffer joint to the support plate is less than or equal to the distance from the second buffer joint to the graphite layer.
Example 1
As shown in fig. 1, the present embodiment discloses a control rod, which includes a rod body 1 and a first buffer node 2, wherein the first buffer node is disposed at an upper portion of the rod body 1, i.e., at an end of the control rod for connecting to a driving mechanism for adjusting a depth of the control rod inserted into a core active region. As shown in fig. 2 and 3, the first cushion section 2 includes a laminated plate 21, a cushion ring, and a first elastic member 22, wherein: the laminated board 21 is fixedly arranged outside the rod body 1 and connected with the outer wall of the rod body 1, and a through hole is formed in the laminated board 21; the shock absorption ring comprises a bottom ring 23 and a vertical column 24, the bottom ring 23 is sleeved outside the rod body 1, the bottom end of the vertical column 24 is connected with the bottom ring 23, and the top end of the vertical column penetrates through a through hole of the laminated board 221; the first elastic member 22 is disposed on the upright post 24, and one end (bottom end) thereof abuts against the bottom ring 23, and the other end (top end) thereof abuts against the laminated board 21.
When taking place the excellent accident of falling, after bottom ring 21 and the backup pad 4 of arranging above the reactor core contact, under the action of gravity, whereabouts objects such as control rod produce great kinetic energy, make laminated board 21 compress first elastic component 22, the kinetic energy that whereabouts object whereabouts process produced is absorbed through the deformation that first elastic component 22 compression produced, thereby play the cushioning effect, the falling speed that makes the control rod obviously reduces or stops the whereabouts, avoid the control rod to take place violent collision and bring great deflection with the graphite layer of reactor core bottom, and then cause the control rod to damage, and die with outside graphite pore card.
Further, the first buffer joint 2 further comprises an adjusting component, the adjusting component is arranged at one end of the upright post 24 close to the laminated board 21, and is arranged at the upper side and the lower side of the laminated board 21 separately from the first elastic member 22, and is used for adjusting the distance between the laminated board 21 and the bottom ring 23.
Specifically, the adjusting assembly comprises a pre-tightening bolt 25 and a gasket 26 matched with the pre-tightening bolt, the post 24 is provided with a central hole, the pre-tightening bolt 25 is inserted into the central hole of the post from the top end of the post 24 and is in threaded connection with the post, the gasket 26 is arranged between the pre-tightening bolt 25 and the laminated plate 21, the outer diameter of the gasket 26 is larger than the diameter of the through hole in the laminated plate 21, the distance between the laminated plate 21 and the bottom ring 23 can be adjusted by rotating the pre-tightening bolt 25, for example, in the installation process, the distance between the laminated plate 21 and the bottom ring 23 is adjusted to adapt to the first elastic members 22 with different heights, so that the two ends of the first elastic members 22 are just in contact with the laminated plate 21 and the bottom ring 23 respectively, of course, a certain pre-tightening force can be applied to the laminated plate 22 by adjusting the pre-tightening bolt 25 according to requirements, and in addition, the post 24 can be prevented from being separated from the through hole in the laminated plate 21 by arranging the pre-tightening bolt 25 and the gasket 26.
In this embodiment, a gap is left between the bottom ring 23 and the rod 1, that is, the bore diameter of the inner bore of the bottom ring 23 is larger than the outer diameter of the rod 1, so as to ensure that the rod and the shock absorption ring can still perform smooth relative movement when the material swells or deforms due to long-term irradiation.
Further, the number of the first elastic members 22 is multiple, the number of the pillars 24 is multiple corresponding to the number of the groups of the first elastic members 22, the multiple pillars 24 are uniformly distributed on the bottom ring 23, the number of the through holes on the laminate 21 is multiple, and the positions of the through holes correspond to the multiple pillars 24 one by one. Through setting up evenly distributed's first elasticity 23, can ensure that falling objects such as control rod among the rod falling accident take place swing motion, make the whereabouts direction remain all the time with the pore of installation control rod coaxial to can avoid control rod and the damage of pore that causes that the inner wall of control rod and pore takes place to rub or collide.
In this embodiment, the laminated plate 21 is preferably ring-shaped, the laminated plate 21 is sleeved outside the rod 1, the inner hole of the laminated plate 21 and the outer wall of the rod 1 can be connected and fixed by welding, and the plurality of through holes are uniformly distributed on the laminated plate 21.
Further, the first elastic member 22 is preferably a disc spring having characteristics of short stroke, large load, etc., and can absorb a large amount of kinetic energy with a small amount of compression, thereby improving the buffering effect of the first buffering section 2.
In this embodiment, as shown in fig. 3, the number of disc springs is preferably four, wherein one or more disc springs connected in series on the same column 24 are in one group. Correspondingly, the number of the upright posts 24 is preferably four, the number of the through holes on the laminated board 21 is also four, and each group of disc springs is sleeved on each upright post 24 respectively.
Furthermore, the control rod in the embodiment further comprises a second buffer joint 3, and the second buffer joint 3 is arranged at the bottom end of the rod body 1 and is of a built-in buffer structure. When a rod falling accident happens, the first buffering joint 2 can play a primary buffering role, when the first buffering joint is compressed to a certain degree, the second buffering joint is in contact with the graphite layer at the bottom of the reactor core and can play a secondary buffering role, so that the rigid collision between the control rod and the graphite layer is optimized, and the control rod and the graphite layer are prevented from being damaged.
Further, as shown in fig. 4 and 5, the second buffer section 3 includes a second elastic member 31, a buffer head 32, and a pre-tightening ring 33, wherein: the bottom end of the rod body 1 is provided with a concave part 11, and the pre-tightening ring 33 is positioned in the concave part 11 and is in threaded connection with the inner wall of the rod body 1; the size of the buffer head 32 is larger than the bore diameter of the pre-tightening ring 33, the head end (in a step shape) of the buffer head 32 penetrates through the bore of the pre-tightening ring 33 and is clamped in the concave portion 11, the second elastic member 31 is arranged in the concave portion 11, one end of the second elastic member 31 abuts against the top end of the concave portion 11, and the other end of the second elastic member 31 abuts against the head end of the buffer head 32.
After the buffer head 32 contacts with the graphite layer of reactor core bottom, buffer head 32 compresses second elastic part 31 under the effect on graphite layer, and the compression deformation through second elastic part 31 can increase the buffering time of contact between buffer head 32 and the graphite layer, reduces the impact force on control rod degree graphite layer to play the cushioning effect, can further ensure to avoid the control rod to take place violent collision and damage with the graphite layer of reactor core bottom, guarantee the integrality on control rod and graphite layer.
Further, a first convex portion 12 is arranged in the concave portion 11, more precisely, the top end of the concave portion 11 is provided with the first convex portion 12, the step-shaped head end of the buffer head 32 extends upwards to form a second convex portion 321, the second elastic member 31 is a compression spring, one end of the second elastic member is sleeved on the first convex portion 12, and the other end of the second elastic member is sleeved on the second convex portion 321, so that the upper end and the lower end of the second elastic member 31 are limited in radial position, and the first elastic member 31 is prevented from generating perpendicularity and straightness deviation in the compression process. In this embodiment, the compression spring used for the second elastic member 31 has better structural flexibility than the disc spring used for the first elastic member 22, which is beneficial to achieving the purpose of increasing the buffering time and reducing the impact force on the graphite layer.
Further, be equipped with boss 331 on the bottom of pretension ring 33, boss 331 stretches out from the bottom of barred body 1, and does not exceed the length of the tail end of buffer head 32 to can prescribe a limit to the maximum compression volume of second elastic component 31, avoid the excessive and unrecoverable deformation that causes of second elastic component 31 compression volume, be favorable to improving the life of second buffering festival 2. In addition, the bosses 331 of the pre-tightening ring 33 can be used to screw the pre-tightening ring in and out with a matching tool when the pre-tightening ring is mounted and dismounted. The number of the bosses 331 is plural, and the plural bosses 331 are symmetrically or uniformly distributed at the bottom end (i.e., the end facing the graphite layer) of the pre-tightening ring 33. In this embodiment, the number of the bosses 331 is four.
Further, a gap is left between the pre-tightening ring 33 and the buffering head 32, and more precisely, the size of the tail end of the buffering head is smaller than the size of the inner hole diameter of the pre-tightening ring 33, so as to ensure that smooth relative movement can still be performed between the pre-tightening ring 33 and the buffering head 32 when the material is swelled or deformed due to long-time irradiation.
Further, the rod body 1 is hollow, a cooling channel 5 is arranged in the rod body, correspondingly, the cooling channel 5 is also arranged in the buffer head 32 and used for circulating coolant, so that the control rod can be cooled in time, the cladding of the control rod is prevented from being over-temperature and losing efficacy, and the service life of the control rod is ensured. Moreover, the cooling channel 5 in the rod body 1 has the reducing section 51, the aperture of the reducing section 51 is different in size, and a gradually opening and reducing structure is formed, for example, the aperture at the inlet of the reducing section 51 is gradually increased, and the aperture at the outlet of the reducing section 51 is gradually decreased, so that when the coolant flows to the reducing section, the flowing speed of the coolant can be changed, the coolant is prevented from generating turbulence to cause vibration of the control rod, and meanwhile, the flowing resistance of the coolant can be reduced, and the total weight of the control rod can be reduced.
The temperature of the environment where the control rod is located can reach 700 ℃ under the normal operation working condition of the reactor, and the temperature of the environment where the control rod is located can reach over 1000 ℃ under the accident working condition.
Therefore, the metal structural components in the control rod in the embodiment are made of nickel-based alloy materials which can resist high temperature continuously. And the contact surfaces of the adjacent metal structural components adopt materials with different grades to carry out solid lubrication treatment so as to avoid mutual occlusion and adhesion between the contact surfaces of the adjacent metal structural components in a high-temperature environment.
In this embodiment, anti-loosening measures are provided between all the parts in threaded contact, such as between the preload ring 33 and the recess 11 of the rod body 1, to prevent disengagement during use and improve the reliability of the control rod.
The control rod of this embodiment can effectively reduce the collision strength on control rod and graphite layer in the rod falling accident, makes control rod and graphite layer avoid damaging to improve the life of control rod, the concrete embodiment is in following aspect:
(1) Through setting up first buffering festival, not only can the kinetic energy that the process of falling of effective absorption control rod produced, thereby play the cushioning effect, make the falling speed of control rod obviously reduce or stop the whereabouts, avoid the control rod to take place violent collision and damage with the graphite layer of reactor core bottom, can also ensure that falling objects such as control rod in the rod accident take place swing motion, it is coaxial with the pore of installation control rod to make the direction of falling remain throughout, thereby can avoid the inner wall of control rod and pore to take place to rub or collide and the control rod that causes and the damage in pore, and then can prolong the life of control rod.
(2) Further, through setting up the second buffering festival, form second grade buffer structure with first buffering festival, the second buffering festival not only can increase the buffer time of contact between buffer head and the graphite layer, reduces the impact force on control rod degree graphite layer, further reinforcing cushioning effect to can furthest reduce the collision strength of control rod and bottom graphite, ensure the graphite layer of control rod and reactor core bottom and avoid taking place violent collision and damage, guarantee the integrality of control rod and graphite layer. Meanwhile, the design of a secondary buffer structure is adopted, so that the bearing position can be increased, and the kinetic energy generated by the falling rod is shared, thereby protecting each component in the reactor core.
(3) Through carrying out radial spacing to the second elastic component in the second buffer joint, the straightness accuracy skew that hangs down that produces when can avoiding the air current disturbance and compressing.
(4) Through setting up the boss, can prescribe a limit to the maximum compression capacity of second elastic component, avoid the excessive and irrecoverable deformation that causes of second elastic component compression capacity, be favorable to improving the life of second buffering festival.
(5) The control rod adopts the cavity formula design, can circulate the coolant to can in time cool off the control rod, avoid the control rod inefficacy, and, through setting up the reducing section, form gradually opening, the control rod vibrations that the reducible coolant torrent caused.
(6) Simple structure, the operation such as processing of being convenient for, installation and part replacement, for traditional control rod structure, the change is little, can be convenient for be used for current reactor.
Example 2:
the embodiment discloses a high-temperature gas cooled reactor, which comprises a reactor core and control rods, wherein a graphite layer is arranged at the bottom of the reactor core, a support plate 4 is arranged above the reactor core, and the control rods in the embodiment 1 are adopted.
When the control rod is positioned on the station, the distance from the first buffer joint to the support plate is less than or equal to the distance from the second buffer joint to the graphite layer.
When a rod falling accident occurs, the first buffer node is firstly contacted with the support plate to play a primary buffer role, so that the falling speed of the control rod is obviously reduced or the control rod stops falling; when the first buffer joint is compressed to a certain degree, the second buffer joint is contacted with the graphite layer at the bottom of the reactor core, and the secondary buffer effect is achieved.
In the high temperature gas cooled reactor of the embodiment, by adopting the control rod in embodiment 1, when a rod drop accident occurs, most of kinetic energy generated when the control rod drops can be absorbed through the mutual cooperation of the secondary buffering and cushioning structures formed by the first buffering section and the second buffering section, so that the collision strength between the control rod and the bottom graphite can be reduced to the maximum extent, the control rod and the graphite layer at the bottom of the reactor core are prevented from being damaged due to severe collision, and the integrity of the control rod and the graphite layer is ensured.
It will be understood that the foregoing is only a preferred embodiment of the invention, and that the invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as within the scope of the invention.
Claims (10)
1. A control rod comprises a rod body (1) and is characterized by further comprising a first buffer joint (2) which is arranged at the upper part of the rod body,
the first cushion section comprises a laminated plate (21), a cushioning ring and a first elastic member (22),
the laminated board is connected with the outer wall of the rod body, and a through hole is formed in the laminated board;
the shock absorption ring comprises a bottom ring (23) and a plurality of stand columns (24), the bottom ring is sleeved outside the rod body, the number of the stand columns is a plurality corresponding to the number of the first elastic pieces, the stand columns are uniformly distributed on the bottom ring, the number of the through holes is also a plurality, the positions of the through holes are in one-to-one correspondence with the stand columns, the bottom ends of the stand columns are connected with the bottom ring, and the top ends of the stand columns penetrate through the through holes of the laminated board;
the first elastic piece is sleeved on the upright post, one end of the first elastic piece is propped against the bottom ring, and the other end of the first elastic piece is propped against the laminated board.
2. The control rod as set forth in claim 1 wherein the first buffer node further comprises an adjustment assembly,
the adjusting assembly comprises a pre-tightening bolt (25), the pre-tightening bolt is inserted into a center hole of the upright from the top end of the upright and is in threaded connection with the upright, and the distance between the laminated board and the bottom ring can be adjusted by rotating the pre-tightening bolt.
3. The control rod as set forth in claim 2, wherein the first resilient members are disc springs, and the number of the first resilient members is plural groups.
4. The control rod as set forth in claim 1, further comprising a second buffer node (3) disposed at a bottom end of the rod body.
5. The control rod as set forth in claim 4, wherein the second buffer node comprises a second spring (31), a buffer head (32), and a preload ring (33),
a concave part (11) is arranged at the bottom end of the rod body, and the pre-tightening ring is positioned in the concave part and is in threaded connection with the inner wall of the rod body;
the head end of the buffer head penetrates through the inner hole of the pre-tightening ring and is clamped in the concave portion, the second elastic piece is arranged in the concave portion, one end of the second elastic piece abuts against the top end of the concave portion, and the other end of the second elastic piece abuts against the head end of the buffer head.
6. The control rod as set forth in claim 5, wherein a first protrusion (12) is provided in the recess, a head end of the buffer head extends upward to form a second protrusion (321),
the second elastic piece is a compression spring, one end of the second elastic piece is sleeved on the first convex part, and the other end of the second elastic piece is sleeved on the second convex part.
7. The control rod as set forth in claim 6, wherein a boss (331) is provided on a bottom of the preload ring, the boss protruding from a bottom end of the rod body and not exceeding a length of a rear end of the dashpot.
8. The control rod as set forth in claim 5, wherein a gap is provided between the dampening ring and the rod body, and a gap is provided between the preload ring and the dashpot head.
9. The control rod as set forth in any one of claims 4 to 8, characterized in that the rod body is hollow, a cooling channel (5) is provided inside the rod body, and the cooling channel has a variable diameter section (51).
10. A high-temperature gas cooled reactor, comprising a reactor core and control rods, wherein the bottom of the reactor core is provided with a graphite layer, a support plate is arranged above the reactor core, the control rods adopt the control rods of any one of claims 4 to 9,
when the control rod is positioned on a station, the distance from the first buffer joint to the support plate is smaller than or equal to the distance from the second buffer joint to the graphite layer.
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| CN202010618944.0A CN111816332B (en) | 2020-07-01 | 2020-07-01 | Control rod and high-temperature gas cooled reactor |
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| CN108492891A (en) * | 2018-04-26 | 2018-09-04 | 中国核动力研究设计院 | A kind of control rod buffer structure |
| CN108922638A (en) * | 2018-07-25 | 2018-11-30 | 中广核研究院有限公司 | A kind of control rod drive mechanism with auxiliary scram device |
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| US3503268A (en) * | 1967-01-12 | 1970-03-31 | Westinghouse Electric Corp | Control rod insertion system |
| JPH0317595A (en) * | 1989-06-15 | 1991-01-25 | Toshiba Corp | Control rod drive mechanism |
| JPH06102390A (en) * | 1992-09-18 | 1994-04-15 | Toshiba Corp | Shock absorber for control rod |
| JPH0926494A (en) * | 1995-07-13 | 1997-01-28 | Hitachi Ltd | Failure inspection device and method for buffer spring of control rod drive device |
| EP1939890A2 (en) * | 2006-12-28 | 2008-07-02 | Korea Atomic Energy Research Institute | Apparatus for falling-shock absorption of control rod of nuclear reactor |
| CN103456374A (en) * | 2013-09-03 | 2013-12-18 | 清华大学 | Reactivity control method of pebble-bed high-temperature gas cooled reactor and telescopiform control rod |
| CN105761765A (en) * | 2016-03-30 | 2016-07-13 | 中国核动力研究设计院 | Star-shaped buffering structure achieving reactor control rod buffering function and method thereof |
| CN106098110A (en) * | 2016-06-16 | 2016-11-09 | 中国核动力研究设计院 | Reactor control rod drives line buffer structure |
| CN108492891A (en) * | 2018-04-26 | 2018-09-04 | 中国核动力研究设计院 | A kind of control rod buffer structure |
| CN108922638A (en) * | 2018-07-25 | 2018-11-30 | 中广核研究院有限公司 | A kind of control rod drive mechanism with auxiliary scram device |
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